Multiple Aspects of PIP2 Involvement in C. elegans Gametogenesis

• Published in: International journal of molecular sciences Vol. 19; no. 9; p. 2679
• Main Authors: Ulicna, Livia, Rohozkova, Jana, Hozak, Pavel
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 10-09-2018; MDPI
• Subjects: Aneuploidy; Animals; C. elegans; Caenorhabditis elegans - genetics; Caenorhabditis elegans - growth & development; Caenorhabditis elegans - metabolism; Caenorhabditis elegans Proteins - genetics; Cell division; Cell Nucleus - metabolism; Chromosomes; Chromosomes - chemistry; Crossovers; Deoxyribonucleic acid; DNA; Embryos; Enzymes; Gametogenesis; Gene Expression Regulation, Developmental; Genetic crosses; Hermaphrodites; Hermaphroditic Organisms - genetics; Hermaphroditic Organisms - growth & development; Hermaphroditic Organisms - metabolism; Kinases; Leucine; Localization; Mammalian cells; Meiosis; Meiotic Prophase I; Nematodes; Nuclei (cytology); Nucleoli; nucleus; phosphatidylinositol 4,5-bisphosphate; Phosphatidylinositol 4,5-diphosphate; Phosphatidylinositol 4,5-Diphosphate - metabolism; Phosphoinositides; Phosphotransferases (Alcohol Group Acceptor) - genetics; PPK-1; Progeny; Prophase; Proteasome Endopeptidase Complex - metabolism; Proteasomes; Proteins; Proteins - metabolism; RNA Interference; RNA polymerase; RNA-mediated interference; Transcription; Ubiquitin; Worms; Czech Republic; nucleus; C. elegans; PPK-1; phosphatidylinositol 4,5-bisphosphate
• ISSN: 1422-0067; 1661-6596; 1422-0067
• DOI: 10.3390/ijms19092679

One of the most studied phosphoinositides is phosphatidylinositol 4,5-bisphosphate (PIP2), which localizes to the plasma membrane, nuclear speckles, small foci in the nucleoplasm, and to the nucleolus in mammalian cells. Here, we show that PIP2 also localizes to the nucleus in prophase I, during the gametogenesis of
hermaphrodite. The depletion of PIP2 by type I PIP kinase (PPK-1) kinase RNA interference results in an altered chromosome structure and leads to various defects during meiotic progression. We observed a decreased brood size and aneuploidy in progeny, defects in synapsis, and crossover formation. The altered chromosome structure is reflected in the increased transcription activity of a tightly regulated process in prophase I. To elucidate the involvement of PIP2 in the processes during the
development, we identified the PIP2-binding partners, leucine-rich repeat (LRR-1) protein and proteasome subunit beta 4 (PBS-4), pointing to its involvement in the ubiquitin⁻proteasome pathway.